Power-operated handsaw.



w. H. HENDERSON. POWER OPERATED HANDSAW.

APPLICATION FILED JUNE 30, 1909.`

Patented N0v.22,191o.

UNirEn srArEs' PATENT orales.

WVILLIAM H. HENDERSON, OF LOS ANGELES, CALIFORNIA, ASSGNOB F ONE-HALF T0ANNA CARPENTER, 0F LOS ANGELES, CALIFORNIA.

POWER-OPEBATED HAN DSAW.

' Specification of Letters Eatent.'

Patented Nov. 22, 1910.

Application led. J' une 30, 1909. Serial No. 505,152.

To all whom it may concern:

Be it known that I, lViLLiAM H. HENDER- sox, a citizen of the UnitedStates, residing at Los Angeles, in the county of Los Angeles and Stateof California, have inventedjnew and useful.Improvements inPower-Operated Handsaws, of which the following is a specification.

This invention relates to a hand saw especially adapted for surgicaland'butchers use, and the prime obJeet'thereof is to provide a Saw whichwill quickly perform the cutting of bones without fraeturing orsplintering them.

The saw consists broadly of a relatively stationary part provided with ahandle which is held from movement by the hand of the operator. The sawframe is mounted on this stationary part and power means are applied torapidly reciprocate. the saw. This extremely rapid rcciproeat-ion admitsof the use of a saw blade with very tine or practically no teeth, andthe cut made is therefore extremely smooth without any liability of thesaw fracturing or splintering the bone.

In the accompanying drawings forming a part of this specification:Figure 1 is a side elevation of my improved saw. Fig. 2 is a plan viewof the same. Fig. 3 is a reverse side elevation ot' the same. Fig. 4 isan enlarg-ed detail of a portion of the power connect-ing clutch.

ln the drawings, 5 designates the body portion of a statiomry framewhich may be constructed of sheet metal. preferably ahunjinum, as this'metal affords. .a sutlicicnt strength with a desirable lightness..Secured in any suitable manner to one vend of plate is a saw handle (iof usual configuration. Mounted on one side of plate is a pair of guidesT ha ring ways therein for the reception Aoil. reciprocating vrods Scarrying on their outer ends saw frame 9.' Saw blade is mounted-iu thesaw frame in the usual manner.

Suitably journaled on plate 5 and passing therethrough is a shaft 11which carries on its ends on thc side ot'rplate 5 adjacent guides.

.reduced portion 18 of shaft, 11.

' desi of a coiled spring 17 mounted around the Flexible shaft 19 fromany suitable source of power, as a small electric motor, is providedwith a terminal sleeve 20 whichtits over the reduced portion 1S of shaft11, and spring 17 and is screwed into the end of movable member 16.01the clutch. Member 16 is provided with a groove 21 in which fingers 22formed on the ends of pivoted clutch operating lever' 23`are adapted toride. Lever 23 isprovided with a thumb piece 24. so that it may bemanipulated .conveniently by the hand upon handle 6 and fingers 22 arearranged at an angle to the vertical, as shown in F ig. 4, so

that upon the downward movement of thumb piece.2-'1- and the upwardmovement` of the fingers, clutch member 16 is forced downwardly and outof engagement with mem-A ber 15. When it is desired that the saw beoperated, thumbpiece 21 is pressed upwardly and spring 17 forces clutchmember 16 into engagement with member 1 5.

This saw is especially adapted to be'oper- .ated by a small motor dvhichruns at a high speed, giving the saw blade up to two'thousandreciprocations per 'minute or thereabout. On account of this hightraveling speed of the saw, the teeth thereof may be made extremely lineand the saw will still cut very rapidly. For cases where an espeeiallysmooth cut is desirable, a plain blade square edges, is used in place ofthe usual saw blade, a small roughness of the hard steel sutlieing toeut the bone at the high cutting speed at which the blade is operated.Further, when atoothed saw is used, the set of the teeth is very slight,if any at all, as it is intended that the side surfaces of the bladeshall rub against the surfaces just cut by the teeth and render -themsmooth.

This saw may be made in different. sizes, weights and configurations tosuit the requirements of several different operations to be performed.The saw for butchers use is about the same size and weight'of the sawnow ordinarily in use, while the saw as ed for surgeons use will be muchsma ler and lighter.

Having described my invention what I' ing a handle, a. body portionattache t0- of steel without any teeth wl1atever,but; with driving meanslocated between -said parallel guideways,' means 'for transmitting powerto said driving means, a clutch between said transinlssxon means andsaiddrlvlng means,

'a lever c'o erating with said clutch carried by said bo y portion and,terminating in a thumb piece adjaeemt said handle, asaw 'frame 'bavingmeans thereon to coperatewith said guldeways, and means connecting saidsaw frame with said drivin gear.

2. A hand 4controlled power too com ris- 'ing a handle; a body portionattache to said handle, guid'eways on said body por tion, a saw frame,means connected to said saw frame and coperating withsaid guide' ways,means to transmit power to said body f port1on,`and driving meanslocated on said body portion between said guideways.

In witness that'I claim the foregoing I have hereuntosubscribed my namethis 22nd day'of June, 1909.

' W. H. HENDERSQN. 'Witnesseslz vEmsmim A. S'rRAUsE, MYRTLE A. PALMER.

